Stumbled across the DosBox project today while trying to get an old DOS game to run under win2k. I was merely trying to get it to do sound and run at the proper speed (VDMSound and SoundFX worked but were tricky), but DosBox is particularly cool as it's a full emulator and will run DOS apps in a window.

Now I'm digging out old DOS games on floppy disks.

Anyway, it's pretty nifty and worth having some fun with. Check it out.